Fluid operated device



3 Sheets-Sheet 1 INVENTOR BY 1 0.1175 MM H. E. PAGE FLUID OPERATED DEVICE Filed Oct. 1, 1945 s x T I P Jan. 21, 1947.

Jan. 21, 1947. PAGE 2,414,484

FLUID OPERATED D EVICE Filed Oct. 1, 1945 3 Sheets-Sheet 2 INVENTOR.

:Hsrzbert E.- 1 :1. 5'

Patented Jan. 21, 1947 UNITED STATES PATENT OFFICE 2;:14A84 1 l 'FLUID OPERATED DEYICE Herbert E. Page, Alhambra, Calif. Applicationoctober 1, 1945, Serial No. 619,661

This invention relates to means for supplying fluid under pressure for the operation of devices such as-vises which may be positioned at a difierent point or difi'erent level than the pressure supplying means. For instance, the vise may be mounted on a work bench while the pressure supplying means may be placed under the bench for foot operation. I y

It is pointed out, however, that the pressure supplying means of the invention is not restricted to the operation of any particular device but has a Wide field of usefulness.

It is an object of my invention to provide a novel and eflicient fluid pressure generating device which functions by virtue of a fluid containing body moving relative to a stationary piston to force a relatively large volume of fluid into a work cylinder at low pressure to move a piston insuch cylinder relatively rapidly into work engaging position and which then functions by virtue of a high pressure-low volume pressur gen-- erating member to more slowly move the piston in its work lifting operation.

' It is a further object of the invention to provide a pressure supplying means of the kind described which may be located in any position convenient for operation.

Another and more specific object is to provide,- in such a device, means for rendering inoperative the large volume-low pressure supplying means at will when it is desired only to use high pressure-low volume operation.

Still further features and objects of the invention will hereinafter appear from the following description taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a central section through one form of the pressure supplying means of the invention;

Fi 2 is an elevation of the form of the inventionshown in Fig, 1, parts being shown in section on line 2-2 of Fig. 1;

' Fig. 3 is a fragmentary detail view on line 3-3 of Fig, 2; v

Fig. 4 is a central section through the cylinder, and parts enclosed thereby, of a hydraulic device supplied with pressure fluid by the device of the invention;

Fig; 5 is a central section through-another form of the pressure fluid supplying means; and Fig. 6 is a-central section of a cylinder supplied with pressure fluid by 'the' pressure supplying means of the form shown in Fig. 5.

Referring now toFig. 1, the pressure supplying means comprises a casing 10 formed to provide a 5 Claims. (01. 6052).

cavity I2 which, in the form shown, may be a cylindrical bore. The casing is mounted for sliding movement toward and-away from the base or mount 14 on a stationary piston l6 supported on the base, the cavity and stationary piston forming a variable volume reservoir for hydraulic fluid. The casing is also formed with an open ended cylinder I8 inwhich a plunger 20 is arranged ior reciprocating movement through a cylinder head and packing gland construction 22, the plunger being operated as shown in Fig, 2

by means of a yoke 24 passing through the head of the plunger and connected at each end to a pair of links 26 and 26a connected at their lower ends to a pair of levers 28 and 28a which are mounted-in. bearings 30 and 30a supported on the base.

The levers may be connected together by a bar (not shown) in a known mannert'o provide for operation by the foot of the user. The levers are normally held in raised position by means of compression springs 32, and the weight of the casing l 0 in this form of the invention is counterbalanced by a spring 34. The cylinder I8 is connected to the cavity I2 by means of a conduit 36 controlled by a ball valve 38 which may be raised on its seat by means of a rod 40 resting on the nected to the piston 48 passes through a sealing gland 58 atth e upper end of the bore 50 and is furnished with a head 58. A pawl'or dog 60 mounted at the end of a pivoted lever 62 is arranged so that it may be caused to raise the piston 48 to remove downward pressure from the ball valve 46 butthe lever is normally held to keep the dog 60 in inoperative position by means ofaspring 64. g r V ,A rod 66 is arranged between ball valves 38 and 46 and when both valves are seated cannot interfere with the operation of either ball valve but when the ball valve 38 is raised by cam 42 through red 4|] the travel of the rod is 'sufficient to transg mitmovement through-ball valve 38 and rod fifi to also raise-the ball valve 46 off its seat. An outlet port 68 for the cavity I2 is enlarged to provide a seatior a ball valve Ill and to form apassage-H; One end of a. flexible conduit 14 is connected in the end of passage 12, the other end of the flexible conduit being connected to the operating cylinder 16 or other device. The passageway 12 is connected by a passage 13 to the bore 50 below the lowermost position of the piston 48.

A piston 78 is arranged in the cylinder 16, and a piston rod 19 passes through the cylinder head 80, and stuffing gland 82. A compression spring 84 is arranged between the cylinder head and the piston.

The fluid pressure supplying device in this form of the invention is shown as being vertically arranged with the weight of the casing counterbalanced by spring 34 so that the spring 84 in the operative device may be relatively weak while serving to return the oil to the pressuresupplying.

means when the vise jaws are to be opened."

The operation of this form of the device is as follows. At the commencement of the operation the casing Ii] is at the upper end of its travel, as limited'by the stop 86,.the cavity I2 is full of hydraulic fluid together with conduit 36. cylinder l8 and all other passages in the casing 10, and the plunger 20 is in fully raised position, the levers 28 therefore being raised. The cam 42 is placed in the operating position, that is, with the low point of the cam under the rod 46 and ball valve 38, so that this valve is free from mechanicalconstraint.

The lever 28 is depressed, thereby forcing the plunger 20 downwardly in the cylinder l8. Downward movement of th plunger'is transmitted to the casing lilsince the spring 52 loading valve '45 is sufiiciently strong to prevent movementof this ball valve until the pressure in the system has been considerably increased. Downward movement of the casing forces oil through the outlet port 63 raising valve Ill off its seat and oil is forced through conduit 14 into cylinder 16, thereby commencing outward travel of the piston 18 against'the resistance of spring 84. On allowing lever 28 to again move upwardly, raising the plunger 2|] in the cylinder IS, a vacuum will be set up in this cylinder, atmospheric pressure acting on the casing Ill will force the casing downwardly and cause hydraulic fluid toflow out of cavity I?! through the conduit 36 to again fill cylinder l3.

Renewed downward pressure on the lever 28 will cause further hydraulic fluid to be'forced into the cylinder of the operated device but the pressure of the fluid acting will be increasedbecause of the increased compression of the spring 8 1. When the fluid pressure is sufficient to raise piston 38 suificiently to remove pressure from the ball valve 45, the hydraulic fluid displaced from the cylinder I8 at each downward. movement of the lever '28 will also pass around ball valve 46 and flow into the outlet passage 12, g

If it is desired to render th quick contact feature temporarily inoperative, lever 62 can be rocked downwardly against the effort of the spring 64 and spring 52, bringing the dog 60 beyond dead center and raising piston 48 to remove downward pressure from the ball valve 46. With this setting-of the valves fluid canbe forced from the cylinder 18 into the. outlet passage 12, resulting in a diminished. now of pressure fluid at'the commencement of .the operation; when thepres, sure in the system has risen sufficiently to raise the piston 48 and therefore to raise head 58 to freedog 6t, springfili will remove this dog from operative position sothat on 'recommencing the 4 cycle of operations, the device will function as first described.

When it is desired to release the pressure of the device the lever 44 is moved downwardly to bring the high point of the cam 42 below the rod 40, thereby pushing ball valves 48 and 36 off their seats, whereupon spring 84 will return the hydraulic fluid in the cylinder 16 to the cavity l2, thereby raising the counterbalanced casing III to the upper limit of its travel." V

The form of the invention shown in Figs. 5 and 6, which has elements generally similar to the corresponding parts described with reference to-Figs; '1 to 4, differs from that shown in Figs. 1 to 4 in that the weight of the casing is not counterbalanc'ed,- the return spring in the cylinder 9.0, of the operated device being made sufficiently strong to raise the weight of the casing, but the operation of th device is in all respects the same as that previously described. It will be notedthat all working chambers of the device in both forms of theinvention are continuously filled with oil sov that no trouble due tov leakage of air into the hydraulic system can oc- Theinvention is hereinabovedescribed and illustrated in preferred forms, but it is to be understood that the scope of the invention is not in any way limited by this illustrative showing but only as indicated by the scope, of the appended claims. i-

I claim: v;

1. In a pressure actuated device having a work cylinder anda work piston reciprocally mounted therein; hydraulic pressure generating means tion at its other end to said work cylinder where by movement of the body in one direction re" tive to the piston forces fluid from the reservoir through said passageway, means for so moving the body including. a pumping cylinder carried by the body parallel with said piston, a plunger reciprocally mounted therein,- valve contro1led means for supplying the pumping cylinder with hydraulic fluid inresponse to the suction stroke of the plunger, and means for trapping said fluid in the pumping cylinder whereby upon the pres-- sure stroke of the plunger to causemoveinent of the body relativeto the piston to force fluid from the reservoir through saidpassageway. 1 I 2. In a pressure actuated device having a-wor cylinder and a work piston reciprocally mounted therein; hydraulic pressure generatingmeans comprising a body having a main cylinder providing afluid reservoir, and a piston therein, 'said body being movable relative to the piston to vary the capacity of the reservoir, a check valve con: trolled.- passageway communicating at its inlet end with the reservoir and adapted for-conned;

tionat its other end to said Work cylinder where- 'bymovement of the body in one direction reia" tive to the-piston forces fiuid- -from the reservoirthrough said passageway, means for so-moving thebody including a pumping cyli-nder carried by the body parallel with said pistoir; aplunger mee w ena le in r spon e t pr dete m s 5 pressure in the pumping cylinder to pass fluid under pressure from the pumping cylinder to the said passageway at a point between its outlet and the check valve controlling said passageway. 3. In a pressure actuated device having a work cylinder and a work piston reciprocally mounted therein; hydraulic pressure generating means comprising a body providing a pumping cylinder and a main cylinder, a piston in the main cylinder and forming with the inner end thereof a fluid reservoir, means securing the piston against axial movement, said body being movable longitudinally of the piston to vary the capacity of the reservoir, a fluid passageway in the body communicating at one end with the reservoir and adapted at its other end for connection to the work cylinder, a check valve in said passageway seating towards the reservoir, a valve bore in the body communicating at its inlet end with the reservoir, a port providing communication between the bore and the pumping cylinder, a conduit providing communication between said bore and said passageway, a first check valve in said bore between the reservoir and said port and seating towards the reservoir, a second check valve in said bore between said port and said passageway and seating towards said port, spring means urging said second check valve seated, a pressure generating plunger reciprocally mounted in the pumping cylinder, means for reciprocating the plunger and means for unseating said first and second check valves.

4. The pressure generating means of claim 3 which includes spring means urging the body and piston apart.

5. The pressure generating means of claim 3 which includes means for relieving the spring pressure on the second check valve.

HERBERT E. PAGE. 

